and welcome to April edition of “Keep Things Flowing”, the monthly
newsletter presented by Storm Water Consulting.
month’s edition of Keep Things Flowing, Darren reviews a technical
presentation that he attended this month entitled “Is CFD Flood
Modelling Within Our Reach” and we answer another frequently asked
This month I
attended an Institution of Engineers technical session titled “Is
CFD Flood Modelling within Our Reach?” This session caught my
attention because of my active interest in 3D graphical fluid
simulations. I learnt the following concepts:
is a distinct difference between traditional 3D fluid models and
their more robust big brother CFD 3D fluid models. The
selection of the appropriate modelling tool comes down to the size
of the required study area, the computational grunt available and
the complexity of the flow regime being modelled.
is an available open source CFD package that can be used for
complex fluid simulations.
results from OpenFOAM can be rendered using the 3D animation
CFD software packages have their pitfalls or limitations.
Unfortunately the software vendors don’t always highlight these
limitations prior to their customer investing a lot of money
purchasing the software and a lot of time learning to use the
software. Therefore tread with caution.
particularly interested in the use of Blender as a fluid simulation
rendering tool. I had thought that I was venturing into new
territory as a specialist hydraulics engineer when I started
utilising this tool over 18 months ago. It is great to see
that I’m not alone in my efforts to use an animation package to add
value to engineering data. If you are interested you can view
my fluid simulations using the following links:
water or Stormwater – Blender Fluid Simulation
House – Blender Fluid Simulation
Arcade – Blender Fluid Simulation
developing my property located within the Brisbane City Council
area. I’ve used Brisbane City Council’s interactive mapping and
Floodwise property report data to determine that my property is inundated
by two types of flood water:
Floodwise property report states a flood level for the Brisbane
River flood event, why hasn’t a minimum finished floor level
therefore been identified?
investigations are a great way of identifying any potential
flooding issues affecting your property. The level of flood water
affecting your property has been identified by Brisbane City
Council (BCC) through the use of hydraulic computer modelling and
recently reported and historical flooding information. Generally if
a property is only affected by Brisbane River flooding, a minimum
finished floor level will be set in the Floodwise property report.
In this case
your property is also subject to inundation from overland flow.
Overland flow is runoff that travels across the land after it
rains, either before entering a waterway, after breaking out of a
waterway, or rising from the ground. There are a vast number of
overland flow paths within the BCC precinct. Council does not have
the resources to determine the flood level for every single
overland flow path. Therefore a hydraulic engineer is required to
determine the flood level due to overland flow and subsequent
minimum finished floor level requirement.
flow flood level may be higher than the Brisbane River flood level
therefore both flood levels must be known before a minimum finished
floor level can be identified.
If you are
faced with this situation we can help by analysing the overland
We hope you
enjoyed this edition of Keep Things Flowing. Feedback on articles
presented is always welcomed and for further information on any of
the articles presented please don’t hesitate to contact our office.
Keep Things Flowing!
The Storm Team
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